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REV. B STRUCTURE Silicon Monolithic Integrated Circuit PRODUCT SERIES Voltage Regulator with Watchdog Timer Reset TYPE ＢＤ３０２１ＨＦＰ－M FEATURES 1. High output voltage precision: 5 V ±2% / low dropout voltage / low quiescent current ：80μA(TYP) 2. INH for WDT(ON/OFF function) /built-in OCP/ built-in TSD ○ABSOLUTE MAXIMUM RATINGS(Ta=25℃) Parameter Symbol Limits Unit Supply Voltage ※1 Vcc -0.3～+50 V INH pin voltage INH -0.3～+15 V Regulator output pin voltage VOUT -0.3～+15 V Reset output pin voltage VRESET -0.3～+15 V Watchdog input pin voltage VCLK -0.3～+15 V Reset delay setting pin voltage VCT -0.3～+15 V Power dissipation ※2 Pd 1.6 W Operating temperature range Topr -40～+125 ℃ Storage temperature range Tstg -55～+150 ℃ Maximum junction temperature Tjmax 150 ℃ ※1 Not to exceed Pd. ※2 Reduced by 12.8mW / °C over Ta = 25°C, w hen mounted on glass epoxy board: 70mm×70mm×1.6mm. ○OPERATING CONDITIONS（Ta=-40～+125℃） Parameter Symbol Min Max Unit Supply Voltage ※3 Vcc 5.6 36.0 V Output Current Io 0 500 mA ※3 For the output voltage, consider the voltage dr op (dropout voltage) due to the output current. NOTE : This product is not designed for protection against radioactive rays. Status of this document The Japanese version of this document is the formal specification. A customer may use this translation version only for a reference to help reading the formal version. If there are any differences in translation version of this document, formal version takes priority.
REV. B ○ELECTRICAL CHARACTERISTICS （Unless otherwise specified, Ta=-40～+125℃，Vcc=13.5V，INH=5V，CLK=GND） Parameter Symbol Limit Unit Conditions Min Typ Max Overall Device Bias current 1 Icc1 － 80 130 μA Io=0mA Bias current 2 Icc2 － 150 300 μA Io=50mA （Ta=25℃） Regulator Output voltage VOUT 4.90 5.00 5.10 V Io=200mA Line regulation Line.Reg － 5 35 mV Vcc=5.6～36V Load regulation Load.Reg － 30 70 mV Io=5～200mA Dropout voltage ΔVd － 0.3 0.6 V Vcc=4.75V, Io=200mA Ripple rejection R.R. 45 55 － dB f=120Hz, ein=1Vrms, Io=100mA Reset Detection voltage Vdet 4.40 4.50 4.60 V Hysteresis width VHS 50 100 150 mV Output delay time Low High （Power on reset time） ※1 TdLH 1.1 1.9 2.7 ms Vdet±0.5V（Vcc=VOUT） CT=0.01μF Low output voltage VRST － 0.1 0.2 V VOUT=4.0V Min. operating voltage VOPL 1.5 － － V Watchdog timer CT switching threshold voltage High VthH 1.08 1.15 1.25 V WDT ON, INH=Open CT switching threshold voltage Low VthL 0.13 0.15 0.17 V WDT ON, INH=Open WDT Charge current Ictc 3.5 6.0 8.5 μA WDT ON, INH=Open, CT=0V WDT Discharge current Ictd 1.2 2.0 2.8 μA WDT ON, INH=Open ,CT=1.3V Watchdog monitor time Low ※2 TWH 3.0 5.0 7.0 ms WDT ON, INH=Open CT=0.01μF（Ceramic Cap） ※Characteristics of ceramic cap not considered. Watchdog reset time ※3 TWL 1.0 1.7 2.4 ms CLK Input pulse width TWCLK 500 － － ns INH WDT OFF threshold voltage VHINH VOUT ×0.8 － VOUT V WDT ON threshold voltage VLINH 0 － VOUT ×0.3 V INH Input current IINH － 10 20 μA INH=5V ※1 TdLH can be changed by varying the CT capacitance value. TdLH(s)≒(1.15×CT(μF))/Ictc(μA) (TYP) ※2 TWH can be changed by varying the CT capacitance value. TWH(s)≒(1.00×CT(μF))/Ictd(μA) (TYP) ※3 TWL can be changed by varying the CT capacitance value. TWL(s)≒(1.00×CT(μF))/Ictc(μA) (TYP) ○PHYSICAL DIMENSIONS, MARKING HRP-7 (UNIT：mm) BD3021 MARKING Lot No.
REV. B ○BLOCK DIAGRAM ○Pin Number, Pin Name Pin Number Pin Name Function
1 CLK Clock Input from
2 INH WDT ON/OFF Function Pin
3 Vcc Power Supply Pin
4 GND GND
5 VOUT Voltage Output Pin
6 RESET Reset Output Pin
External Capacitance for Reset Output Delay Time, WDT Monitor Time Setting Connection Pin FIN GND GND ○Pin Settings / Precautions 1. Vcc pin Insert a 0.33μF～1000μF capacitor between the Vcc and GND pins.The appropriate capacitance value varies by application. Be sure to allow a sufficient margin for input voltage levels. 2. Output pins It is necessary to place capacitors between each output pin and GND to prevent oscillation on the output. Usable capacitance values range from 0.1μF～1000μF. Abrupt fluctuations in input voltage and load conditions may affect the output voltage. Output capacitance values should be determined only through sufficient testing of the actual application. ○Operation Notes 1. Absolute maximum ratings Use of the IC in excess of absolute maximum ratings (such as the input voltage or operating temperature range) may result in damage to the IC. Assumptions should not be made regarding the state of the IC (e.g., short mode or open mode) when such damage is suffered. If operational values are expected to exceed the maximum ratings for the device, consider adding protective circuitry (such as fus es) to eliminate the risk of damaging the IC. 2. Electrical characteristics described in these specifications may vary, depending on temperature, supply voltage, external circu its and other conditions. Therefore, be sure to check all relevant factors, including transient characteristics. 3. GND potential The potential of the GND pin must be the minimum potential in the system in all operating conditions. Ensure that no pins are at a voltage below the GND at any time, regardless of transient characteristics. 4. Ground wiring pattern When using both small-signal and large-current GND traces, the two ground traces should be routed separately but connected to a single ground potential within the application in order to avoid variations in the small-signal ground caused by large currents. Also ensure that the GND traces of external components do not cause variations on GND voltage. The power supply and ground lines must be as short and thick as possible to reduce line impedance. 5. Inter-pin shorts and mounting errors Use caution when orienting and positioning the IC for mounting on printed circuit boards. Improper mounting may result in damage to the IC. Shorts between output pins or between output pins and the power supply or GND pins (caused by poor soldering or foreign objects) may result in damage to the IC. 6. Operation in strong electromagnetic fields Using this product in strong electromagnetic fields may cause IC malfunction. Caution should be exercised in applications where strong electromagnetic fields may be present. CLKedge WDT VthH VthL INH Vcc GND VOUT RESET CT TSD VREF PREREG Vcc Vcc VREF_R OCP VREF_R ON/OFF Curcuit
REV. B 7. Testing on application boards When testing the IC on an application board, connecting a capacitor directly to a low-impedance pin may subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should always be turned off completely before connecting or removing it from a jig or fixture during the evaluation process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during transport and storage. 8. Thermal consideration Use a thermal design that allows for a sufficient margin in light of the Pd in actual operating conditions. Consider Pc that does not exceed Pd in actual operating conditions. （Pd≧Pc） Tjmax : Maximum junction temperature=150℃, Ta : Peripheral temperature[℃] , θja : Thermal resistance of package-ambience[℃/W], Pd : Package Power dissipation [W], Pc : Power dissipation [W], Vcc : Input Voltage, VOUT : Output Voltage, Io : Load, Icc2 : Bias Current2 Package Power dissipation : Pd (W)＝(Tjmax－Ta)／θja Power dissipation : Pc (W)＝(Vcc－VOUT)×Io＋Vcc×Icc2 9. Over current protection circuit (OCP) The IC incorporates an integrated over-current protection circuit that operates in accordance with the rated output capacity. This circuit serves to protect the IC from damage when the load becomes shorted. It is also designed to limit output current (without latchi ng) in the event of a large and instantaneous current flow from a large c apacitor or other component. These protection circuits are effect ive in preventing damage due to sudden and unexpected accidents. However, the IC should not be used in applications characterized by t he continuous or transitive operation of the protection circuits. 10. Thermal shutdown circuit (TSD) The IC incorporates a built-in thermal shutdown circuit, which is designed to turn the IC off completely in the event of thermal overload. It is not designed to protect the IC from damage or guarantee its operation. ICs should not be used after this function has activated , or in applications where the operation of this circuit is assumed. 11. Applications or inspection processes where the potential of the Vcc pin or other pins may be reversed from their normal state m ay cause damage to the IC's internal circuitry or elements. Use an output pin capacitance of 1000μF or lower in case Vcc is shorted with the GND pin while the external capacitor is charged. Insert a diode in series with Vcc to prevent reverse current flow, or insert bypass diodes between Vcc and each pin. 12. Positive voltage surges on VCC pin A power zener diode should be inserted between VCC and GND for protection against voltage surges of more than 50V on the VCC pin. 13. Negative voltage surges on VCC pin A schottky barrier diode should be inserted between VCC and GND for protection against voltages lower than GND on the VCC pin. 14. Output protection diode Loads with large inductance components may cause reverse current flow during startup or shutdown. In such cases, a protection diode should be inserted on the output to protect the IC. 15. Regarding input pins of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. PN junctions are formed at the intersection of these P layers with the N layers of other elements, creating parasitic diodes and/or transistors. For example (refer to the figure below):
- When GND > Pin A and GND > Pin B, the PN junction operates as a parasitic diode
- When GND > Pin B, the PN junction operates as a parasitic transistor Parasitic diodes occur inevitably in the structure of the IC, and the operation of these parasitic diodes can result in mutual in terference among circuits, operational faults, or physical damage. Accordingly, conditions that cause these diodes to operate, such as app lying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should be avoided. Example of Simple Monolithic IC Architecture Parasitic elements (Pin A) Parasitic elements or transistors (Pin B) C B E N P N N P+ P+ Parasitic elements or transistors P substrate (Pin B) C B E Transistor (NPN) (Pin A) N P N N P+ P+ Resistor Parasitic elements P GND N GND GND
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